Switch just stops working every day?

August 24, 2011 at 19:15:07
Specs: Windows XP
In one section of my network, I have a switch, connected to another switch, that has two powered-down PCs, a security camera DVR and two network cameras (via another switch) connected to it. Periodically, everything connected to this switch disappears from the network. If I unplug the switch, wait a few seconds and plug it back in, everything works fine. Thinking I had a bad switch, I traded out the old one for a brand new Trendnet and I still have the same problem. I am hoping someone has some suggestions as this is getting very annoying (it doesn't even last 24 hours). The switch is plugged into a UPS so power blinks shouldn't be a problem.

Thank you in advance for any thoughts you may have on this.


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#1
August 25, 2011 at 01:58:55
If that downstream switch and all it's attached devices disappear from your network, and you have already replaced the switch then the problem would seem to be upstream of that. What device is upstream of the new switch? A router ? Another switch? A patch panel?

Goin' Fishin' (Some day)


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#2
August 25, 2011 at 04:18:02
Upstream is another switch. I can try using another port on the upstream switch, but the switch as a whole works fine as there are other devices connected to it that have no problems.

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#3
August 25, 2011 at 08:38:17
I would try another port on the upstream switch.

Also, I would use a crossover cable when interconnecting two switches. Yes, I'm know it isn't absolutely necessary if you have auto MDIX capable switches but it's still a recommended practice and removes one more thing to check when troubleshooting issues like this.

In fact, I would wait on the crossover until you've tried a different port (it's always a good idea to do one troubleshooting step at a time). If the problem persists, change to a crossover cable and see if the issue goes away.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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#4
August 26, 2011 at 14:08:45
Yesterday, I switched ports on the upstream switch and the downstream devices came back immediately, no powering down the downstream switch required. Today, the devices were gone again. I switched to yet another port this morning and everything came back immediately. Gone again by this afternoon.

I can reterminate the existing cable as a crossover if you think that would help. Running a new cable would be a real pain as it is roughly 100' long and goes through two walls.

This is just driving me mad. It works perfectly for a few hours and then just disappears. Nothing else on the upstream switch has any issues and the downstream switch works fine if you just pull out the cable and plug it back in. Where is the sense in that?

Thank you for these and any other suggestions.


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#5
August 26, 2011 at 14:29:43
Definitely reterminate and make the cable a crossover. If both switches are 1000 Mbps, do remember to cross all wires and make a true 1000 Mbps crossover. Just swapping the green/orange pair limits you to 100 Mbps. Don't forget to test your cable......and I don't mean with one of those "next best thing to useless" blinking light testers. If you don't have a real tester you'll have to wing it or hire a cabling specialist to come in and test for you.

If this doesn't fix the issue I'm at a loss. I never did ask, is the upstream switch mangaed or unmanaged?

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***


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